<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
    <input type="text" v-model="un">
        {{un}}
</div>
<script src="js/vue.js"></script>
<script >
    new Vue({
        el:"#app",
        data:{
            un:"哈哈"
        }
    })
</script>


</body>
</html>